We have a 300L (79 gallons) buffer tank, and our heating is supplied by district heating. Currently, the heating boost is set to run from 5:30 a.m. to 10 p.m. I have read that it is better to start the heating boost from around midday to optimize the efficiency of the solar thermal system, since the water is colder and can absorb energy more effectively. That sounds reasonable to me.
My question is: How much can I reduce the district heating boost time for domestic hot water production? At the same time, I want to ensure that Legionella prevention is adequately addressed. Currently, my domestic hot water temperature is set to 65°C (149°F). Would it theoretically be sufficient to run the heating boost for about 1 hour per day to raise the tank temperature to 65°C (149°F) and thus prevent Legionella?
What would be the most efficient approach regarding the solar thermal system in this context?
My question is: How much can I reduce the district heating boost time for domestic hot water production? At the same time, I want to ensure that Legionella prevention is adequately addressed. Currently, my domestic hot water temperature is set to 65°C (149°F). Would it theoretically be sufficient to run the heating boost for about 1 hour per day to raise the tank temperature to 65°C (149°F) and thus prevent Legionella?
What would be the most efficient approach regarding the solar thermal system in this context?
This is how it looks, because if you just let it run, both will keep heating the storage tank whenever it’s empty, regardless of whether it makes sense or not. The district heating kicks in after the morning shower, and the solar thermal system only later, but by then you’ve already spent the money. The goal here is to prevent that.
The solar thermal system should heat all the water as long as there is sunlight. District heating should only start when there is no longer a chance to draw energy from the solar thermal system to fill the storage tank.
The solar thermal system should heat all the water as long as there is sunlight. District heating should only start when there is no longer a chance to draw energy from the solar thermal system to fill the storage tank.
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